The fourth security safeguard of the inspection wells in Hangzhou, the auto alarming sightcing.
Hangzhou always ranks in the front when it refers to the safety protection related to wells. The use of steel fiber reinforced concrete well lid prevented the stealing behavior. The addition of the security net ensured that even you slipped into the well without a well lib, you are safe from being hurt by stepping into the well. Also to buy insurance for the inspection wells guarantee that once some people stepped into the well and was hurt he or she will receive some compensation.
Source: Hangzhou Network